[hunter2_]

Does this distinguish white backgrounds from transparent backgrounds? For example, a graph consisting of anything-on-white should probably be inverted, while a graph consisting of pure red on transparent should probably not be inverted. For the latter, increasing the luminance (i.e. make it pink on transparent) might be best, followed by leaving it as-is, followed by inverting.

But I guess with ML reinforced by human feedback, trends like this manifest without having to explicitly handle them as special cases at all...